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    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      /* italic倾斜 normal正常*/
      .atguigu {
        /* font-style: italic; */
        font-style: normal;
      }
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    <div class="atguigu">尚硅谷</div>
    <!-- em语意加强+++ -->
    <em>尚硅谷4</em>
    <strong>尚硅谷30</strong>
  </body>
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